Easy money, super-sized frack jobs, and desperate drillers offering deep discounts to oil producers – all three have been credited for sustaining U.S. crude output during the worst price slump in six years. Now there appears to be a new factor in the mix: old vertical wells that can quickly be drilled, injected with water or fracked for a second time to increase production at low cost. Overshadowed by the fracking boom that delivered record oil and gas volumes, vertical wells are making a comeback as investors and producers shift focus away from production growth to capital discipline in the downturn. “It makes more sense to develop vertical wells in a lower price environment because they are not growth plays but they are a very strong cash flow asset,” said Benjamin Shattuck, principal analyst at Wood Mackenzie. “They are going to give you that cash flow that you need […]